Same problem here with i830 chipset. In dmesg I see the following carnage as X
is starting:
[drm] Initialized i915 1.1.0 20040405 on minor 1:
mtrr: base(0xe8020000) is not aligned on a size(0x300000) boundary
agpgart: pg_start == 0x00000000,intel_i830_private.gtt_entries == 0x000007df
agpgart: Trying to insert into local/stolen memory
mtrr: base(0xe8020000) is not aligned on a size(0x300000) boundary
Note, this is on a laptop with the non-SMP kernel.

(In reply to comment #13)
> Aside: Although the Intel 915GM isn't supported, there is an easy update
> available from
> http://dri.freedesktop.org/snapshots
> It would be great to get that folded in. A lot of recent laptops use this chip.
Intel i915GM support was added in the update this bug is filed against
already. ;o)